This I regarded as a great success, and it removed from my mind the most serious apprehensions I had entertained, that of crossing the river in the face of an active, large, well-appointed, and ably commanded army, and how so large a train was to be carried through a hostile country, and protected.

Early on the 5th, the advance corps (the fifth, Major-General G.K.Warren commanding) met and engaged the enemy outside his intrenchments near Mine Run.

The battle raged furiously all day, the whole army being brought into the fight as fast as the corps could be got upon the field, which, considering the density of the forest and narrowness of the roads, was done with commendable promptness.
General Burnside, with the ninth corps, was, at the time the Army of the Potomac moved, left with the bulk of his corps at the crossing of the Rappahannock River and Alexandria Railroad, holding the road back to Bull Run, with instructions not to move until he received notice that a crossing of the Rapidan was secured, but to move promptly as soon as such notice was received.

This crossing he was apprised of on the afternoon of the 4th.

By six o'clock of the morning of the 6th he was leading his corps into action near the Wilderness Tavern, some of his troops having marched a distance of over thirty miles, crossing both the Rappahannock and Rapidan rivers.